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/* pdch_ul_controller.c
*
* Copyright (C) 2021-2023 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* Author: Pau Espin Pedrol <pespin@sysmocom.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <inttypes.h>
#include <unistd.h>
#include <talloc.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/linuxrbtree.h>
#include <osmocom/gsm/gsm_utils.h>
#include <osmocom/gsm/gsm0502.h>
#include <osmocom/gprs/rlcmac/pdch_ul_controller.h>
#include <osmocom/gprs/rlcmac/rlcmac_private.h>
#include <osmocom/gprs/rlcmac/types_private.h>
#include <osmocom/gprs/rlcmac/sched.h>
/* TS 44.060 Table 10.4.5.1 states maximum RRBP is N + 26. Give extra space for time diff between Tx and Rx? */
#define MAX_FN_RESERVED (27 + 50)
const struct value_string gprs_rlcmac_pdch_ulc_poll_reason_names[] = {
{ GPRS_RLCMAC_PDCH_ULC_POLL_UL_ASS, "UL_ASS" },
{ GPRS_RLCMAC_PDCH_ULC_POLL_DL_ASS, "DL_ASS" },
{ GPRS_RLCMAC_PDCH_ULC_POLL_UL_ACK, "UL_ACK" },
{ GPRS_RLCMAC_PDCH_ULC_POLL_DL_ACK, "DL_ACK" },
{ GPRS_RLCMAC_PDCH_ULC_POLL_CELL_CHG_CONTINUE, "CELL_CHG_CONTINUE" },
{ 0, NULL }
};
struct gprs_rlcmac_pdch_ulc *gprs_rlcmac_pdch_ulc_alloc(void *ctx, uint8_t ts_nr)
{
struct gprs_rlcmac_pdch_ulc *ulc;
ulc = talloc_zero(ctx, struct gprs_rlcmac_pdch_ulc);
if (!ulc)
return ulc;
ulc->ts_nr = ts_nr;
ulc->pool_ctx = talloc_pool(ulc, sizeof(struct gprs_rlcmac_pdch_ulc_node) * MAX_FN_RESERVED);
return ulc;
}
struct gprs_rlcmac_pdch_ulc_node *gprs_rlcmac_pdch_ulc_get_node(struct gprs_rlcmac_pdch_ulc *ulc, uint32_t fn)
{
OSMO_ASSERT(ulc);
struct rb_node *node = ulc->tree_root.rb_node;
struct gprs_rlcmac_pdch_ulc_node *it;
int res;
while (node) {
it = rb_entry(node, struct gprs_rlcmac_pdch_ulc_node, node);
res = gsm0502_fncmp(it->fn, fn);
if (res > 0) /* it->fn AFTER fn */
node = node->rb_left;
else if (res < 0) /* it->fn BEFORE fn */
node = node->rb_right;
else /* it->fn == fn */
return it;
}
return NULL;
}
struct gprs_rlcmac_pdch_ulc_node *gprs_rlcmac_pdch_ulc_pop_node(struct gprs_rlcmac_pdch_ulc *ulc, uint32_t fn)
{
struct gprs_rlcmac_pdch_ulc_node *item = gprs_rlcmac_pdch_ulc_get_node(ulc, fn);
if (!item)
return NULL;
rb_erase(&item->node, &ulc->tree_root);
return item;
}
struct rrbp_opt {
uint8_t offset;
enum gprs_rlcmac_rrbp_field coding;
};
static struct gprs_rlcmac_pdch_ulc_node *_alloc_node(struct gprs_rlcmac_pdch_ulc *ulc, uint32_t fn)
{
struct gprs_rlcmac_pdch_ulc_node *node;
node = talloc_zero(ulc->pool_ctx, struct gprs_rlcmac_pdch_ulc_node);
node->fn = fn;
return node;
}
static int gprs_rlcmac_pdch_ulc_add_node(struct gprs_rlcmac_pdch_ulc *ulc, struct gprs_rlcmac_pdch_ulc_node *item)
{
struct rb_node **n = &(ulc->tree_root.rb_node);
struct rb_node *parent = NULL;
while (*n) {
struct gprs_rlcmac_pdch_ulc_node *it;
int res;
it = container_of(*n, struct gprs_rlcmac_pdch_ulc_node, node);
parent = *n;
res = gsm0502_fncmp(item->fn, it->fn);
if (res < 0) { /* item->fn "BEFORE" it->fn */
n = &((*n)->rb_left);
} else if (res > 0) { /* item->fn "AFTER" it->fn */
n = &((*n)->rb_right);
} else {
LOGRLCMAC(LOGL_ERROR, "TS=%" PRIu8 " Trying to reserve already reserved FN %u\n",
ulc->ts_nr, item->fn);
return -EEXIST;
}
}
rb_link_node(&item->node, parent, n);
rb_insert_color(&item->node, &ulc->tree_root);
return 0;
}
int gprs_rlcmac_pdch_ulc_reserve(struct gprs_rlcmac_pdch_ulc *ulc, uint32_t fn,
enum gprs_rlcmac_pdch_ulc_poll_reason reason,
void *data)
{
struct gprs_rlcmac_pdch_ulc_node *item = _alloc_node(ulc, fn);
item->reason = reason;
item->data = data;
LOGRLCMAC(LOGL_DEBUG, "Register POLL (TS=%u FN=%u, reason=%s)\n",
ulc->ts_nr, item->fn,
get_value_string(gprs_rlcmac_pdch_ulc_poll_reason_names, item->reason));
return gprs_rlcmac_pdch_ulc_add_node(ulc, item);
}
void gprs_rlcmac_pdch_ulc_release_node(struct gprs_rlcmac_pdch_ulc *ulc, struct gprs_rlcmac_pdch_ulc_node *item)
{
rb_erase(&item->node, &ulc->tree_root);
talloc_free(item);
}
int gprs_rlcmac_pdch_ulc_release_fn(struct gprs_rlcmac_pdch_ulc *ulc, uint32_t fn)
{
struct gprs_rlcmac_pdch_ulc_node *item = gprs_rlcmac_pdch_ulc_get_node(ulc, fn);
if (!item)
return -ENOKEY;
gprs_rlcmac_pdch_ulc_release_node(ulc, item);
return 0;
}
void gprs_rlcmac_pdch_ulc_release_tbf(struct gprs_rlcmac_pdch_ulc *ulc, const struct gprs_rlcmac_tbf *tbf)
{
bool tree_modified;
do {
struct rb_node *node;
struct gprs_rlcmac_pdch_ulc_node *item;
tree_modified = false;
for (node = rb_first(&ulc->tree_root); node; node = rb_next(node)) {
item = container_of(node, struct gprs_rlcmac_pdch_ulc_node, node);
if (item->tbf != tbf)
continue;
/* One entry found, remove it from tree and restart
* search from start (to avoid traverse continue from
* no-more existent node */
tree_modified = true;
gprs_rlcmac_pdch_ulc_release_node(ulc, item);
break;
}
} while (tree_modified);
}
void gprs_rlcmac_pdch_ulc_expire_fn(struct gprs_rlcmac_pdch_ulc *ulc, uint32_t fn)
{
struct gprs_rlcmac_pdch_ulc_node *item;
int res;
struct rb_node *first;
while ((first = rb_first(&ulc->tree_root))) {
item = container_of(first, struct gprs_rlcmac_pdch_ulc_node, node);
res = gsm0502_fncmp(item->fn, fn);
if (res > 0) /* item->fn AFTER fn */
break;
if (res < 0) { /* item->fn BEFORE fn */
/* Sanity check: */
LOGRLCMAC(LOGL_ERROR,
"TS=%" PRIu8 " Expiring FN=%" PRIu32 " but previous FN=%" PRIu32 " is still reserved!\n",
ulc->ts_nr, fn, item->fn);
}
rb_erase(&item->node, &ulc->tree_root);
LOGRLCMAC(LOGL_NOTICE, "TS=%u Timeout for registered POLL (FN=%u, reason=%s)\n",
ulc->ts_nr, item->fn, get_value_string(gprs_rlcmac_pdch_ulc_poll_reason_names, item->reason));
talloc_free(item);
}
}
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